A blood test is a laboratory analysis performed on a blood sample that is usually extracted from a vein in the arm using a hypodermic needle , or via fingerprick . Multiple tests for specific blood components, such as a glucose test or a cholesterol test , are often grouped together into one test panel called a blood panel or blood work . Blood tests are often used in health care to determine physiological and biochemical states, such as disease , mineral content, pharmaceutical drug effectiveness, and organ function. Typical clinical blood panels include a basic metabolic panel or a complete blood count . Blood tests are also used in drug tests to detect drug abuse. In some of the United States, a blood test is required before marriage.
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